// 设置响应头中间件
module.exports = async (ctx, next) => {
    var contentType = 'application/json; charset:utf-8';
    ctx.set('Content-Type', contentType);
    // ctx.response.body = '{"success",true}';
    // 解决跨域问题
    ctx.set("Access-Control-Allow-Origin", "*")
    ctx.set("Access-Control-Allow-Methods", "OPTIONS, GET, PUT, POST, DELETE")
    await next();
}